Spare blade storage box of utility knife



FIG. 1 is a top, front, right perspective view of a spare blade storage box of utility knife showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view showing the spare blade storage box of utility knife in use.

The broken lines in the drawings illustrate portions of the spare blade storage box of utility knife which form no part of the claimed design.

The dot-dashed line in the figures defines the boundary of claimed design and forms no part of the claimed design. 

CLAIM We claim the ornamental design for a spare blade storage box of utility knife, as shown and described. 